namespace StudySystemClient {
	public class IterableBox<T> : Gtk.Box {
		private List<T> elements;

		public IterableBox(Gtk.Orientation orientation, int spacing) {
			this.orientation = orientation;
			this.spacing = spacing;
			elements = new List<T>();
		}

		public new void append(T element) {
			elements.append(element);
			base.append(element as Gtk.Widget);
		}

		public new void remove(T element) {
			elements.remove(element);
			base.remove(element as Gtk.Widget);
		}

		public Iterator<Type, T> iterator() {
			return new Iterator<Type, T>(elements);
		}

		public void sort(CompareDataFunc<T> comparison) {
			elements.sort_with_data(comparison);
			foreach (var element in elements)
				reorder_child_after(element as Gtk.Widget, null);
		}

		public class Iterator<Type, T> {
			private unowned List<T> head;
			private unowned T value;

			public Iterator(List<T> elements) {
				head = elements;
			}

			public bool next() {
				if (head.is_empty())
					return false;
				value = head.data;
				head = head.next;
				return true;
			}

			public unowned T get() {
				return value;
			}
		}
	}
}